Sub-Zero reference · Denver, CO
EC 23 is an overheated defrost recorded together with no voltage back down the feedback lead. Sub-Zero Pro Repair Denver treats that combination as one episode rather than two failures — (720) 704-2791.
Sub-Zero Pro Repair Denver — (720) 704-2791
Built-In 600-3 Series control boards and their stored codes
The list Sub-Zero prints here is borrowed, and reading it that way saves a visit. Three of its four checks come straight from code 21: the seating of the sensor and the heater, the blue lead’s terminal, and any short across from it. The fourth is the single line code 22 carries.
What is absent is the terminator temperature test. That one belongs to code 21 by itself. And two faults inside one cycle rarely means two failures, so we look first at what has recently been touched.
Both halves in memory on a unit that was opened up last month
Two symptoms from one visit. A sensor put back out of position accounts for the heat; a connector left hanging accounts for the silence.
No band covers this one — quoted after the diagnosis
The terminator testing good and the code standing anyway
Expected here. Sub-Zero leaves the terminator temperatures off this code's list altogether — they belong to code 21 alone, and chasing them here spends the visit.
No band covers this one — quoted after the diagnosis
Clean wiring end to end and the pair coming back
The board, reached last. Two faults logged in one cycle can come from a single connector on it, which is why the wiring is proved before anything is priced.
Control board $430–$940
Not for long. An overheating defrost is putting heat into the compartment while nothing is confirming the cycle, so both the food and the record are unreliable. Read the stored codes and get the panel off. Of the defrost group this is the entry we would not leave standing.
Where this sits
Bench notes from
Tobias Reinhardt
Checked against
Sub-Zero service manual #7003192 Rev C for the Built-In (600-3) Series: error code table, p. 8-2, and the four checks printed against code 23, p. 8-3
Reading it with you
Tell us what the panel is showing and we will tell you what we would measure first. Sub-Zero Pro Repair Denver — (720) 704-2791. On the road 8:00 am – 8:00 pm, seven days.
Describe the symptom on the phone and you will usually hear what it probably is before anyone drives out. A $89 service call covers the visit and the full diagnosis in Denver, and comes off the repair once you approve it.